/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ This program is free software; you can redistribute it and/or modify         │
│ it under the terms of the GNU General Public License as published by         │
│ the Free Software Foundation; version 2 of the License.                      │
│                                                                              │
│ This program is distributed in the hope that it will be useful, but          │
│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
│ General Public License for more details.                                     │
│                                                                              │
│ You should have received a copy of the GNU General Public License            │
│ along with this program; if not, write to the Free Software                  │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
│ 02110-1301 USA                                                               │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/nt/winsock.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/sysv/errfuns.h"

static int shutdown$nt(struct Fd *fd, int how) {
  if (__shutdown$nt(fd->handle, how) != -1) {
    return 0;
  } else {
    return __winsockerr();
  }
}

/**
 * Disables sends or receives on a socket, without closing.
 *
 * @param fd is the open file descriptor for the socket
 * @param how can be SHUT_RD, SHUT_WR, or SHUT_RDWR
 * @return 0 on success or -1 on error
 * @asyncsignalsafe
 */
int shutdown(int fd, int how) {
  if (!IsWindows()) {
    if (!IsXnu()) {
      return shutdown$sysv(fd, how);
    } else {
      /* TODO(jart): What's wrong with XNU shutdown()? */
      return 0;
    }
  } else if (__isfdkind(fd, kFdSocket)) {
    return shutdown$nt(&g_fds.p[fd], how);
  } else {
    return ebadf();
  }
}